Whether you piggy back off the radio or, say, the interior lights should be of little consequence, the only thing that matters if the hot side is always hot or key-on hot. All the hot sides of either are connected inside the fuse box anyway.
That is for outgoing fuses. I have to admit that jacking this system in backwards could be how the radio/van switch functions- providing two hot switched leads into one fuse output... hmmm.
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it was good to be back
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